blocks|key|218210|text|最新版本的adb工具似乎有一个“允许降级标志”，在adb帮助中没有显示，但它显示在设备上的"pm“帮助中。所以使用：adb+install+-r+-d+<link+to+apk>|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|218211|entityMap^0|1M|V|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

It appears the latest version of adb tools has an "allow downgrade flag" that isn't shown in the adb help, but it is shown in the "pm" help on the device. So use:
<code>adb install -r -d &lt;link to apk&gt;</code>

blocks|key|436319|text|您可以尝试使用adb+uninstall+-k+<package>，然后安装较旧的apk。从adb使用指南中：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|436320|++adb+uninstall+[-k]+<package>+-+remove+this+app+package+from+the+device
+++++++++++++++++++++++++++++++++('-k'+means+keep+the+data+and+cache+directories)|code-block|syntax|javascript|436321|我已经用我的apk自己试过了，它似乎对大多数数据都有效(一些数据，比如RawContacts没有保存)|436322|entityMap^0|7|Q|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

You can try and use <code>adb uninstall -k &lt;package&gt;</code> and then installing the older apk.
From the adb usage guide: 

<pre><code> adb uninstall [-k] &lt;package&gt; - remove this app package from the device
 ('-k' means keep the data and cache directories)
</code></pre>

I've tried it myself with my apk, and it seems to work for most of the data (some data like RawContacts was not saved)

blocks|key|436267|text|您是否在设备上启用了多个账号(并通过ADB推送apk+)？如果是这样，你必须删除每个帐户中的apk。完全卸载后，您的推送就可以了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|436268|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Did you enabled Multiple account on your device (and push your apk via ADB)? 
If so you have to remove the apk in every account. After complete uninstall, your push will be OK.

blocks|key|436443|text|在我的例子中，它是包含在我的项目中的一个过时的Google+Play服务版本。我使用的是Android+Studio。我在SDK上运行了一个更新，并导入了更新后的库，这个错误就消失了。因此，我的建议是:更新到项目引用的最新库。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|436444|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my case it was a stale version of Google Play Services included with my project. I am using Android Studio. I ran an update on the SDK, and imported the updated library, and that error went away. So my suggestion: update to the latest libraries that are referenced by your project.

blocks|key|218316|text|我也面临着同样的problem.It，可以通过以下步骤来解决，这些步骤比从设备上删除任何apk更容易-|type|unstyled|depth|inlineStyleRanges|entityRanges|data|218317|1)在终端上运行"adb+logcat+%7C+grep+-i+version“命令|218318|2)查找特定行，它将显示在logcat的末尾-|218319|"Downgrade+detected:+Update+version+code+5011++is+older+than+current+9109"|code-block|syntax|javascript|218320|3)复制当前版本(如9109)，粘贴到AndroidManifest.xml中，如下图所示：|218321|android:versionCode="9109"|218322|现在清理并重新构建应用程序，它应该可以正常工作。|218323|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|U|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|V|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

I also faced the same problem.It can be resolved with below steps which are easier than deleting any apk from the device -

1) Run command "adb logcat | grep -i version" on the terminal

2) Look for the particular line, which will be shown at the end of the logcat -

<pre><code>"Downgrade detected: Update version code 5011 is older than current 9109"
</code></pre>

3) copy the current version( for eg 9109) and paste it in AndroidManifest.xml as shown below - 

<pre><code>android:versionCode="9109"
</code></pre>

Now clean and rebuild the application and it should work fine.

blocks|key|218339|text|尝试使用以下命令卸载以前安装的应用程序版本-|type|unstyled|depth|inlineStyleRanges|entityRanges|data|218340|adb+uninstall+com.package.name|code-block|syntax|javascript|218341|然后再次安装/运行应用程序|218342|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Try uninstalling previously installed version of app using-

<pre><code>adb uninstall com.package.name
</code></pre>

and then install/run your app again

blocks|key|436481|text|您可能是从代码的单独副本安装的，该副本的版本号高于您当前正在使用的副本。在任何一种情况下，卸载当前安装的副本，或打开设置>应用程序以确定已安装应用程序的版本号，并在AndroidManifest中增加您的versionCode更高。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|436482|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You might have installed from a separate copy of the code where the version number was higher than the copy you’re working with right now. In either case, uninstall the currently installed copy, or open up Settings > Apps to determine the version number for the installed app, and increment your versionCode to be higher in the AndroidManifest.

blocks|key|218372|text|这可能是Google+Play服务依赖项的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|218373|有时，情况并非如此：|218374|a)已安装应用程序的现有版本，无论是否更新|218375|b)设备上的另一个用户帐户上安装了应用程序的现有版本|218376|所以这个错误消息是假的。|218377|在我的例子中，我有：|218378|implementation+'com.google.android.gms:play-services-maps:16.0.0'
implementation+'com.google.android.gms:play-services-location:16.0.0'
implementation+'com.google.android.gms:play-services-gcm:16.0.0'|code-block|syntax|javascript|218379|但当我试着|218380|implementation+'com.google.android.gms:play-services-maps:17.0.0'
implementation+'com.google.android.gms:play-services-location:17.0.0'
implementation+'com.google.android.gms:play-services-gcm:17.0.0'|218381|我收到了与androidX相关的错误，因为我还没有升级到androidX，也没有准备好这样做。我发现使用最新的16.x.y版本可以工作，并且我不再收到错误消息。此外，我可以等到我准备好的时候，再升级到androidX。|218382|implementation+'com.google.android.gms:play-services-maps:16.%2B'
implementation+'com.google.android.gms:play-services-location:16.%2B'
implementation+'com.google.android.gms:play-services-gcm:16.%2B'|218383|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|14|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|15|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|16|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|17|8|@]|9|@]|A|$]]|$1|S|3|T|5|N|7|18|8|@]|9|@]|A|$O|P]]|$1|U|3|V|5|6|7|19|8|@]|9|@]|A|$]]|$1|W|3|X|5|N|7|1A|8|@]|9|@]|A|$O|P]]|$1|Y|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|Z|$]]

It may be a problem with the Google Play Services dependencies.

Sometimes, it is NOT the case that:

a) there is an existing version of the app installed, newer or not

b) there is an existing version of the app installed on another user account on the device

So the error message is just bogus.

In my case, I had:

<pre><code>implementation 'com.google.android.gms:play-services-maps:16.0.0'
implementation 'com.google.android.gms:play-services-location:16.0.0'
implementation 'com.google.android.gms:play-services-gcm:16.0.0'
</code></pre>

But when I tried

<pre><code>implementation 'com.google.android.gms:play-services-maps:17.0.0'
implementation 'com.google.android.gms:play-services-location:17.0.0'
implementation 'com.google.android.gms:play-services-gcm:17.0.0'
</code></pre>

I got androidX related errors, as I had not yet upgraded to androidX and was not ready to do so. I found that using the latest 16.x.y versions work and I don't get the error message any more. Furthermore, I could wait till later when I am ready, to upgrade to androidX.

<pre><code>implementation 'com.google.android.gms:play-services-maps:16.+'
implementation 'com.google.android.gms:play-services-location:16.+'
implementation 'com.google.android.gms:play-services-gcm:16.+'
</code></pre>

blocks|key|436617|text|卸载现有已安装的应用程序。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|436618|检查您是否更改了项目包名称，因为包名称与现有应用程序冲突。|436619|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Uninstall existing installed app.
check if you have changed project package name ,
Because of package name , It gets conflicts with existing app.

blocks|key|436625|text|对我来说，只有这样才行得通：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|436626|adb+install+-t+-r+-d+myapp.apk|code-block|syntax|javascript|436627|顺便说一句，我要替换的应用程序，downgrade是一个系统应用程序|436628|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

For me only this works fine:
<pre><code>adb install -t -r -d myapp.apk
</code></pre>
Btw, the app, which I want to replace, and downgrade is a system app

blocks|key|218408|text|在我的例子中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|218409|第1步:运行|218410|yarn+start+--reset-cache|code-block|syntax|javascript|218411|第2步:运行|218412|yarn+android|218413|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

In my case:
Step 1: Run
<pre><code>yarn start --reset-cache
</code></pre>
Step 2: Run
<pre><code>yarn android
</code></pre>

blocks|key|218348|text|对于那些面临小米问题的人来说：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|218349|adb+shell+pm+uninstall+<package_name>|code-block|syntax|javascript|218350|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For people facing issues with Xiaomi:

<pre><code>adb shell pm uninstall &lt;package_name&gt;
</code></pre>

It seems like the most recent Android 4.2 has introduced this error condition on installation when one attempts to install an APK with a lower version. In prior versions of Android, one would be able to install older APK's simply via <code>adb install -r &lt;link to APK&gt;</code>. For debugging purposes, I frequently need to re-test older APK's; and the <code>-r</code> flag would replace the older build in older Android versions. Is there a work-around here to ignore <code>[INSTALL_FAILED_VERSION_DOWNGRADE]</code>?

Is there any way to ignore INSTALL_FAILED_VERSION_DOWNGRADE on application install with the Android Debug Bridge?

似乎最新的Android 4.2在安装时引入了这个错误条件，当一个人试图安装一个较低版本的APK时。在以前的安卓版本中，人们可以简单地通过adb install -r <link to APK>安装旧的APK。出于调试目的，我经常需要重新测试较旧的APK；而-r标志将替换较旧的Android版本中的较旧版本。是否有替代方法可以忽略[INSTALL_FAILED_VERSION_DOWNGRADE]

问有没有办法在Android Debug Bridge上安装应用程序时忽略INSTALL_FAILED_VERSION_DOWNGRADE？
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